1.00 g of He, 14.0g F2, and 19.0 g Ar are placed in a 13.0-L container at 20.0 °C. The total pressure (in atm) in the container is _____ atm.

A stretched rubber band has potential energy.

Potential energy is the energy of position.

You put work energy into the band when you stretched it.

Now, the band has the potential to do work when you let go and allow it to return to its unstretched state.

304 kg*ms or in ms 84.48 kgm/s

Hey there!

Given the reaction:

P4 + 10 Cl2  ------------------ 4 PCl5

Molar mass P4 = 124 g/mol

Number of moles P4:

n = mass of solute / molar mass

n = 24.0 / 124

n = 0.1935  moles of P4

Therefore:

1 mole P4 --------------- 4 moles PCl5

0.1935 moles P4 ------- moles PCl5

moles PCl5 = 0.1935 * 4

= 0.774 moles of PCl5

Hope that helps!

I would be c. valence electrons. This is because all atoms want to be chemically stable so elements that have 8 valence electrons are chemically stable like neon or any of the noble gases.

Hey there. I did not build a model for you. Below is a picture of a Plant Cell that you could get some ideas from.

Best Of Luck,

     - Ari -

A plant cell is a type of cell found in green plants that is responsible for photosynthesis. It contains a cell wall, chloroplasts, and a central vacuole, which distinguish it from animal cells. Plant cells also include plastids and typically do not have lysosomes or centrosomes.

A plant cell is a type of cell found in green plants that is responsible for performing photosynthesis. It contains various elements that distinguish it from animal cells. Major components include:

Unlike animal cells, plant cells also contain plastids and do not usually have lysosomes or centrosomes.

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You have elements, compounds, and mixtures.

Salt water is a mixture.

To determine the empirical formula of a compound with 63.65% nitrogen and 36.35% oxygen, calculate the moles of each element based on their mass percentages and atomic masses. After finding moles, derive the simplest ratio which provides the empirical formula N₂O.

Finding the Empirical Formula

To find the empirical formula of a compound with 63.65% nitrogen and 36.35% oxygen by mass, we will need to perform a few calculations. First, we assume we have 100 grams of the compound. This makes it easy to convert percentage to grams directly, so we have 63.65 grams of nitrogen and 36.35 grams of oxygen. Next, we divide the mass of each element by its atomic mass to find the number of moles of each element: nitrogen (N) has an atomic mass of approximately 14.01 g/mol, and oxygen (O) has an atomic mass of approximately 16.00 g/mol.

For nitrogen: 63.65 g N / 14.01 g/mol N = 4.54 mol N
For oxygen: 36.35 g O / 16.00 g/mol O = 2.27 mol O

Then, we find the simplest ratio of the moles of each element by dividing each by the smallest number of moles we calculated:

Ratio of N to O is 4.54 mol N / 2.27 mol O = 2. Since we are looking for the simplest whole number ratio, the empirical formula is N₂O.

Explanation:

When a charged object is brought near a neutral object and when both of them touch each other then the neutral object also acquires the same charge that is present on the charged object.

This process of charge transfer is known as conduction.

So, when a ruler that is negatively charged touches a metal rod then the metal rod also becomes negatively charged because of conduction process.

This is because negative charge moves from the rules towards the metal rod and hence, it spreads over to the metal rod.

When you rub a ruler against a metal rod, something called charging by friction happens and the ruler can transfer charge to the rod.

When you rub a ruler against a metal rod, something called charging by friction happens and the ruler can transfer charge to the rod. Here is a simple explanation of how charge is transferred, explained step-by-step:

Starting Point: At first, the ruler and metal rod have the same amount of positive and negative charges, which makes them neutral.

Contact: The ruler touches the metal rod. When the ruler touches the rod, some of the electrons from the atoms in the ruler can move to the atoms in the rod.

To create friction, we rub the ruler against the metal rod while they touch each other. When you rub the ruler against the rod, they touch each other more strongly and exchange electrons.

When the ruler rubs against the rod, some of the electrons from the ruler's surface may move onto the rod's surface. This movement of electrons creates an uneven charge between the two objects.

Charge separation occurs when electrons are transferred. In this case, the ruler has gained extra electrons and becomes negatively charged, while the metal rod loses electrons and becomes positively charged.

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Scientist believe that about 25 of the known elements are essential to life. Just four of these - Carbon (C), Oxygen (O), Hydrogen (H), and Nitrogen (N), - make up about 96% of the human body.

These four elements are found in the basic structure of all biochemical molecules. For example, Glucose is a carbohydrate and it's molecular formula is C6H12O6 - each molecule of glucose is made up of 6 Carbon atoms, 12 Hydrogen atoms and 6 oxygen atoms.

The other elements found can be divided into two main groups - major elements and trace elements.

The human body functions as a result of a large number of the chemical reactions involving compounds of a of these elements.

Understanding how elements and compounds react together is key in our daily lives because it influences how we produce and use materials, maintain health, and generate energy. Knowledge of chemical reactions helps in predicting outcomes, creating new substances and improving products.

Understanding how elements and compounds react together is of great importance in our daily lives as we constantly engage with products and processes resulting from chemical reactions. For instance, compounds are formed when two or more elements chemically combine, like how hydrogen and oxygen form water, or how sodium and chlorine combine to create table salt. This knowledge is essential in the fields of medicine, technology, energy production, and even in food preparation and preservation.

There are over 100 elements that can be combined in myriad ways to form millions of different chemical compounds, each of which has unique physical and chemical properties. Knowing how these elements and compounds interact allows us to predict outcomes, create and improve products, and better understand the world around us.

Furthermore, chemical processes and reactions are integral to our existence, providing sustenance, maintaining our health, producing our electronic devices, and enabling transportation, among other things. For example, the energy we use to heat our homes, drive our cars, and generate electricity often comes from the combustion of certain compounds. This vital process of burning materials for energy release is a chemical reaction.

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Answer:

protons

neutrons

helium

Explanation:

it is correct

The answer depends on what substances you were testing, but here are some ideas.

If all of them were white as in the typical experiment, then color is not very useful.  If you were allowed to taste them, then a salty taste would be a helpful clue.  If the textures were different, some crystals, like salt or sugar and others powdery, like flour or cornstarch, those properties would be helpful.  If some dissolved in water,...

Both physical and chemical properties can be used to identify a mystery powder. Physical properties include characteristics like color, texture, mass, and volume, while chemical properties entail reactions with other substances or heat.

In order to identify a mystery powder, both physical and chemical properties can be highly useful. Physical properties, such as the powder's color, texture, mass, and volume can give us certain clues about the substance. For instance, certain substances may have a specific color or texture unique to them.

On the other hand, chemical properties are equally useful. These include reactions the powder has to various chemicals or heat, and its ability to burn or support burning. For example, if a powder reacts vigorously with an acid, it could be a base. If it burns with a certain color flame, it could be a specific type of metal.

Therefore, the choice between using physical or chemical properties often depends on the mystery powder in question. However, a combination of both types of properties can provide the most accurate identification.

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Page:1

12. I think the answer would be True ( not that sure )

13. It would die because it would not be able to perform Photosynthesis ( wouldn't be able to make its own food) without any Water, or sunlight.

Page:2

1: C

2: A

3: B

Page: 3

4. Mold, Grass, and Tree.

5. Grasshopper, frog, Snake, monkey, caterpillar, and a fish.

Page: 4

6. Mushroom, Bacteria

CO32- and OH- are the two most common anions in antacids.

Answer:

negative ions.:

Hydroxyde ion (OH-)

Carbonate ion. (CO3 -- )

Explanation:

Acids generally, when are mixed in water, produces a lot of positive hydrogen protons, also knew as protons (H +) are responsible for raising the pH.

pH is (power of hydrogen), it means the more positive hydrogens ions more acid will be that substance. So the antacid's role, to neutralize these positive charges is to add more negative ions to the solutions.

In the stomach, when the stomach acid is liberated to degrade the food, it produces a lot of these protons (H +). The antacids who helps to neutralize this, most commonly used are, (OH-) and (CO3--).Acids generally, wher ar mixed in water, produce a lot of positive hydrogen protons, also knowed as protons (H+) are responsable for rise the pH.

Actually, pH are (power of hydrogen), it means the more positive hydrogens ions more acid will be that substance. So the antacids role, to neutralize this positive charges is add more negative ions to the solutios.

In the stomach, when the stomach acid are liberate to degradate the food, produces a lot of these protons (H+). The antacids who hepls to neutralize this, most commos used are, (OH-) and (CO3-- ).

This anions can be provide for substances like aluminum hydroxyde, magnesium hydroxyde, aluminium carbonate, and others..

These anions can be provided for substances like aluminum hydroxide, magnesium hydroxide, aluminum carbonate, and others.

Hey there!

Mass = 640 g

Density = 0.8 g/mL

Volume = ?

Therefore:

D = m / V

0.8 = 640 / V

V = 640 / 0.8

V = 800 mL

hope that helps!

Answer:

The answer is: 0.8 Liters

Explanation:

In order to find the volume of the oil, we have to divide the weight of the oil over the density, so we are going to know the volume in mL:

(640 g) / (0.8 g/ml) = 800 mL

Now, if we want the answer in liters, and we know 1 L (liter) is 1000 mL (mililiters), just divide 800 mL over 1000.

C. A plant with chlorophyll a and chlorophyll b will absorb a greater range of light than it would if it had chlorophyll a only.

Chlorophyll a is the primary photosynthetic pigment while chlorophyll b is the accessory pigment that collects energy and passes it on to chlorophyll a.

Chlorophyll a absorbs energy from wavelengths of blue-violet and orange-red light while chlorophyll b absorbs energy from wavelengths of green light.

the answer is 39.58 lbs

You’re welcome

The total shipping weight for the bicycle and its box is the sum of the individual weights, which is 40.3 pounds.

The question asks for the total shipping weight of a bicycle and its box. The weight of the bicycle is given as 32.5 pounds and the weight of the box is 7.8 pounds. To find the total shipping weight, we simply add these two weights together:

Bicycle weight: 32.5 pounds

Box weight: 7.8 pounds

Total shipping weight = Bicycle weight + Box weight

Total shipping weight = 32.5 pounds + 7.8 pounds

Total shipping weight = 40.3 pounds

This is the combined weight of the bicycle and its box that would be used to determine shipping costs.

Balanced chemical reaction:

2FeBr₃(aq) + 3Na₂S(aq) → Fe₂S₃(s) + 6NaBr(aq).

Ionic reaction:

2Fe³⁺(aq) + 3Br⁻(aq) + 6Na⁺(aq) + 3S²⁻(aq) → Fe₂S₃(s) + 6Na⁺(aq) + 6Br⁻(aq).

Net ionic reaction: 2Fe³⁺(aq) + 3S²⁻(aq) → Fe₂S₃(s).

FeBr₃ - iron(III) bromide.

Na₂S - sodium sulfide.

Fe₂S₃ - iron(III) sulfide.

NaBr - sodium bromide.

Answer:

Net ionic equation is [tex]2Fe^{3+}(aq.)+3S^{2-}(aq.)\rightarrow Fe_{2}S_{3}(s)[/tex]

Explanation:

First write total ionic equation and then remove spectator ions from both side of equation to get net ionic equation. To write total ionic equation, separate all aqueous species into their constituting ions.

Total ionic equation-

[tex]6Na^{+}(aq.)+3S^{2-}(aq.)+2Fe^{3+}(aq.)+6Br^{-}(aq.)\rightarrow Fe_{2}S_{3}(s)+6Na^{+}(aq.)+6Br^{-}(aq.)[/tex]

Here [tex]Na^{+}and Br^{-}[/tex] are spectator ions as they are presnt on both side of equation.

Hence net ionic equation is [tex]2Fe^{3+}(aq.)+3S^{2-}(aq.)\rightarrow Fe_{2}S_{3}(s)[/tex]

Answer:

Explanation:

In research an unreliable source is the one which cannot be accepted by the scientific community. Such source generally includes the information which is not authentic and correct. Such source may include manipulation or unreliable results. The facts mentioned in some unreliable source are not based upon experimental testing.

The answer would be C

If wheelchairs weren't here then people who need them wouldn't be able to go out and enjoy the world as people do today. People who use hearing aids wouldn't be able to hear anything. They would be deaf, they wouldn't be able to hear voices, music, or anything that people with hearing aids or people who hear normal get to hear. Hope that helps you. If you need more help just let me know!

If wheelchairs were not available then people are not able to move by their own and without hearing aids, people are not able to listen others voice.

Technology in science plays an important role as in the modern era every work or thing is possible by using the technology.

Wheelchairs and hearing aids are the example of technology which helps the people with leg and ear issue respectively. If wheelchairs are not available then people are not able to go anywhere or do work by their own. And without hearing aid, people are not able to communicate as they already have some listening issue.

Hence, without wheelchair and hearing aids people were not able to move and listen by themselves.

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Here are three everyday situations which it would be useful to identify unknown substances:

1. When you have two clear substances with no labels yet you are not sure which substance is water and which one is not and not knowing what this unknown chemical might do.

2. A stain on your clothes

3. When you are not feeling well and your sense of taste is not functioning well.

The ways that these can be identified is first, start by the appearance, for example the state, color, texture, etc. And secondly, use your sense of smell. This sense is also helpful in identifying whether the substance is something strong or not.

Everyday identification of an unknown substance can be done using spot tests, measuring optical properties, or additional tests for organic or inorganic compounds, utilizing simple tools such as lasers, protractors, and chemical reagents.

Identifying an unknown substance is crucial in various everyday situations, like determining if a liquid spill is water or some hazardous chemical. One practical method for identification is using a spot test, where a chemical reagent is added to the substance, and the presence of a specific substance is indicated, for example, through a color change. Another approach might involve determining the substance's optical properties using equipment such as a laser or a protractor to measure the substance's refractive index compared to a reference guide.

In situations where a mixture contains more than one substance, additional properties like density could be considered to differentiate substances, but recognizing composite materials would require more complex analysis that considers a combination of characteristics.

For organic or inorganic identification, specific chemical tests that highlight carbon presence could be utilized, as organic compounds characteristically contain carbon. A simple burn test could provide preliminary information: if the sample burns with a yellow flame, it's likely organic, indicating the presence of carbon.

1. This can be due to the dissolving of the solid in liquid and form a solution.

Dissolving is a physical property because dissolving doesn't form new substances and the chemical composition of the solid is not changed.

The color building up over the time can be due to the rate of dissolving of the solid and amount of particles have been dissolved.

Example:

2. This can be due to the chemical reaction between the solid and liquid.

Chemical reaction is a chemical property because from reacting substances new substances can be formed which the chemical formula is different from initial substances.

The color building up over the time can be due to the rate of the reaction and the amount of reactants.

Example:

       Ca(s) + 2H₂O(l) → Ca(OH)₂(aq) + H₂(g)

Answer:  2 H₂  +  O₂    →    2 H₂O

Reasoning:

When balancing an equation, what you are trying to do is to ensure that the amount of each atom on the right side (reactant side), is equal to the amount of each atom on the left side (product side), because of the law of conservation of energy.

∴ the balanced equation is     2 H₂  +  O₂    →    2 H₂O

The answer is C, The sports drink

Have you got to design a business card for Beth? If so what business is it for? Xx

ya know what good for beth! I am happy for "beth" lol wth tho!

The cell membrane is the structure responsible for maintaining the homeostasis of the cell.

The structure responsible for maintaining the homeostasis of the cell is the cell membrane. It acts as a barrier that controls the movement of substances in and out of the cell, allowing the cell to maintain a stable internal environment. The cell membrane is made up of a phospholipid bilayer that is selective in what it allows to pass through.

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if this is is a True or False question I think it would be (False). Because the continental crust is lighter than the oceanic crust, and the continental crust cannot subduct.

Answer:

False.

Explanation:

Ocean lithosphere is about 60km thick and very dense, whereas continental lithosphere is about 120km and less dense. That is why when they collide, ocean plates subduct under continental ones.

Answer:- 240029 cans.

Solution:- As per the given information, 32537 cans were collected in September and 207492 cans were collected in October. It asks how many Cans were collected in October and September.

It is an addition problem so let's add the two given numbers of cans:

Total cans = 32537+207492 = 240029

So, 240029 cans were collected in October and September.

Liberty Elementary School collected a total of 240,029 cans in September and October, by adding 32,537 cans collected in September to 207,492 cans collected in October.

The question asks to find the sum of cans collected in September and October by Liberty Elementary School. In September, they collected 32,537 cans and in October they collected 207,492 cans.

To find the total number of cans collected over the two months, we add the number of cans collected in September to the number of cans collected in October:

32,537 (September) + 207,492 (October) = 240,029

Hence, the total number of cans collected in September and October is 240,029.

Answer:

A. The rate of reaction increase

Explanation: